Completion System

;;; completion-conf.el --- Built-in Completion  -*- lexical-binding: t; -*-
;;; Commentary:
;; Uses only Emacs built-in completion functionality.
;; - icomplete-vertical-mode for minibuffer completion UI
;; - flex completion style for fuzzy matching
;; - completions-detailed for annotations
;; - recentf for recent files
;; - savehist for completion history
;;; Code:

;;; Minibuffer Completion UI
(use-package icomplete
  :ensure nil
  :init
  (icomplete-vertical-mode 1)
  :custom
  (icomplete-delay-completions-threshold 0)
  (icomplete-compute-delay 0)
  (icomplete-show-matches-on-no-input t)
  (icomplete-scroll t)
  (icomplete-prospects-height 10)
  :bind (:map icomplete-minibuffer-map
         ("RET" . icomplete-force-complete-and-exit)
         ("TAB" . icomplete-force-complete)
         ("C-n" . icomplete-forward-completions)
         ("C-p" . icomplete-backward-completions)))

;;; Completion Styles
(use-package minibuffer
  :ensure nil
  :custom
  (completion-styles '(flex basic partial-completion emacs22))
  (completion-category-defaults nil)
  (completion-category-overrides '((file (styles partial-completion))))
  (completion-ignore-case t)
  (read-buffer-completion-ignore-case t)
  (read-file-name-completion-ignore-case t)
  (completions-detailed t)
  (completions-format 'one-column)
  (completions-max-height 20))

;;; Recent Files
(use-package recentf
  :ensure nil
  :init
  (recentf-mode 1)
  :custom
  (recentf-max-saved-items 100)
  :bind ("C-x C-r" . recentf-open-files))

;;; Completion History
(use-package savehist
  :ensure nil
  :init
  (savehist-mode 1))

;;; Keybindings for built-in commands
(global-set-key (kbd "M-g i") 'imenu)
(global-set-key (kbd "C-c s l") 'occur)
(global-set-key (kbd "C-c s g") 'grep)

(provide 'completion-conf)
;;; completion-conf.el ends here